Hot-air furnace



UNITED STATES PATENT OFFICE.

BENJAMIN BROIVNELL, OF CHICAGO, ILLINOIS.

HOT-AIR FURNACE.

Specification forming part of Letters Patent No. 58,057, dated September18, 1866.

To all whom it may concern:

Be it known that I, BENJAMIN BROWNELL, of Chicago, in the county ofCook, in the State of Illinois, have invented a new and ImprovedSoft-Coal Hot-Air Furnace and I do hereby declare that the following isa full and exact description thereof, reference bcin g had to theaccompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in a gradual enlargement of theradiating lines from bottom to top on the scale of five-eighths of oneinch to one foot, thereby insuring a larger amount of hot air than wouldbe made in. straight fines, and the placing a domeshaped casting in thecenter of the fines, directly over the tire-pot, two-thirds of thedistance from the bottom to the top plate, which compels the heat topass outside and around the fines before passing into the smoke-drum,and also causes the burning of a great part of the soot and gas arisingfrom the soft coal by forcing them back into the fire.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

My furnace has a cast-iron base, (marked A,) with openings to admit coldair. Resting on this is a cast-iron ash-pit, (marked 13.) On this reststhe fire-pot, also of cast-iron, (marked 0.) Fitting closely on the topof fire-pot rests the cast-iron bottom plate, (marked D,) to whichradiating fines, (marked E,) constructed of heavy wrought-iron and openat both ends, are attached by collars. The cold air enters ,at bottom ofthese fines, and is heated while passing through into the hot-airchamber above, The fines are also attached by collars to the cast-iron topplate, (marked F.) Directly over the fire-pot, two-thirds of thedistance from bottom to top plate, resting on wrought-iron lugs rivetedto the fines, is placed a dome shaped iron casting, (marked Gr.)' Overthis casting, fitting closely above the top plate, is the sheet-ironsmoke-drum, (marked H,) which receives the smoke, and from which it ispassed through the smoke-pipe(marked I) to the chin ney. Around theradiating fines is placed a heavy wrought-iron case, (marked K,)attached by flanges to the top and bottom plates. The whole is inclosedin a galvanized-iron case, (marked L,) composed of four sections,comnected by cast-iron rings, the upper part of which comprises thehot-air chamber, to which hot-air pipes are attached. The feed-door to I'fire-pot is placed on this case, being also connected by cast-iron heckto the inner case.

WVhat- I claim as my invention is- The gradually-enlarged flues E,arranged and combined with the dome-shaped casting Grin a hot-airfurnace, substantially as and for the purposes herein set forth.

BENJAMIN BROWNELL.

Witnesses:

J. A. LYNnoN, R. H. Mason.

